Count the Books on Shelf

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?




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You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
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In a classic wine shop, the list of three most popular wines are:
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Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.